It is revealed that Gideon is a fan of contemporary art and that Reid was 12 years old when he graduated from high school.
On the plane ride to L.A., JJ mentions that the L.A. media is calling Natalie Ryan's murder "the biggest celebrity homicide since Sharon Tate." Tate was famously murdered by members of the Manson family in 1969 as part of Charles Manson's delusional attempt to start his "Helter Skelter" race war.
When the team is interviewing Lila, the name on the desk is Sgt. G Kershaw, Glenn Kershaw is a producer on the show.
At the end of this episode, Lila tells Reid she will come see him if she ever gets to Washington. The BAU is located in Quantico, Virginia, which is considered suburban Washington D.C.